Ductwork, static pressure, airflow and balancing

Verify that ductwork can actually carry required airflow without excessive noise, comfort loss or fan energy.

Important: this tool helps decide what to verify; it does not replace calculations, permits or professional design where required.

VERT / GREEN

Replace filters and document blocked registers or uncomfortable rooms.

JAUNE / YELLOW

A heat pump, restrictive filter, room renovation or flex duct can change airflow and pressure.

ROUGE / RED

High static pressure, insufficient airflow, crushed/inaccessible ducts or safety trips: mechanical diagnosis required.

Indicative triage

High airflow noise
Measure airflow/pressure before randomly closing registers. Several uncomfortable rooms
Perform a distribution and balancing review. New central heat pump
Verify return, supply and filter can carry required airflow. Clean filter and documented airflow
Keep values as commissioning baseline.

Useful tools and data

Static-pressure manometer
Airflow measurement
Duct layout

What the professional checks

Measure total external static pressure
Verify duct and return capacity
Balance and document airflow

Official sources

RNCan — thermopompe et conduits

Sources checked / sources vérifiées: 2026-08-22

V26

Often-overlooked service interfaces

V26 connects systems that cross utility, plumbing, HVAC, envelope and metering boundaries.

Water pressure, PRV and thermal expansionHVAC zoning and motorized dampers